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Snip summary	How does StumbleUpon figure out what topic a website is ... automatically categorizes pages into over 500 different ... the words present on the pages. This system is approxima... effective, when it is not we rely on stumblers to correc... made by the StumbleUpon FAQ http://www.stumbleupon.com/help.html#wrongrating

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Full snip	How does StumbleUpon figure out what topic a website is in?StumbleUpon automatically categorizes pages into over 500 different topics based on the words present on the pages. This system is approximately 90% effective, when it is not we rely on stumblers to correct the mistakes made by the categorizer. In particular, highly graphical pages are difficult to automatically categorize.